WASHINGTON — The Supreme Court said Wednesday that Illinois can, for now, keep in place a new law that bars the sale of certain semi-automatic guns and large-capacity magazines.The high court denied an emergency request from people challenging the law, which bans so-called assault weapons. The law’s opponents had asked the court to put the law on hold while a court challenge continues. The court did not comment and no justice publicly dissented.The high court’s action comes at a time when gun violence has …